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(No Model.) 2 Sheets-Sheet 1 J. MAHLA.

APPARATUS FOR GRINDING BUTTON EDGES.

No. 389,812. ted Sept. 11, 1888.

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J. MAI-ILA.

APPARATUS FOR GRINDING BUTTON EDGES.

. Mia/9 No. 389,812. Patented Sept. 11, 1888.

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UNrTnn STATES PATENT @rrrcn.

JACOB MAHLA, OF .lABLONZ-ON-NEISSE, BOHEMIA, AUSTRIA-HUNGARY.

APPARATUS FOR GRINDING BUTTON-EDGES.

SPECIFICATION forming part of Letters Patent No. 389,312, datedEeptember 11, 1888.

Application filed December 8, 1886. Serial No. 220,947.

Jul 3,1S86,No. 177,175; 1586,1171. 14,050.

(No model.) Patented in G ermuny July 3, 1886, No. 315,264; in France inAustriallungury October ll. 19%, No, 22,410, and No. 51,378, and inEngland November 17,

To aZZ whom i2? may concern.-

Be it known that I, JACOB MAHLA, manufacturer, a subject of the EmperorofGermany, residing at Gablonz-on-Neisse, in the Province of Bohemia, inthe Empire of Austria-Hungary, haveinvented certain new and usefulImprove lnentsinApparatusforGrindingButton-Edges, (for which LettersPatent in the following countries have been granted, viz: inAustria-Hungary, (Vienna,) No. 22,430, and (Buda-Pesth) N0. 5l,378,datedOctober 21, 1886; in Germany, No. 38,264, dated July 3, 1886; in France,No. 177,175, dated July 3, 1886, and in England, No. 14,950, datedNovember 17, 1886;) and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, and to lettersor figures of reference marked thereon,which form a part of thisspecification. I Figure 1 is a sectional side elevation of myImprovement, and Fig. 2 is a plan view of the same. Fig. 3 is aperspective view of mymachine, partly in section and parts being brokenaway, ofthe stationary bongoue spindle, and its operating and connectedparts on an enlarged scale, part of the griudingwheel being shown bydotted lines.

The object of my invention is to provide a new and improved machine forgrinding the edges of buttons into a cylindrical or conical shape.

The invention consists in the construction and arrangement of variousparts and details and combinations of the same, as will be fullydescribed hereinafter, and then pointed out in the claims.

In a suitably-eonstructed stationary box, B, revolves the cylindricalgrinding wheel C, mounted on the shaft 0, provided with the usualdriving-pulley, 0, for imparting rotary motion to the said shaft and itswheel. Parthe box.

dle-frame A, supporting in a socket, a, the lower end of the spindle a,which is held near its upper end in a suitable bearing on the arm a,projecting from the said spindle-frame A. The spindle a is provided witha Worm-wheel, a meshing i nto thehorizontal worm E, secured to a shaft,6, mounted in bearings 6', adapted to slide laterally on suitablesupports.

On the spindle a screws a cover, to, protecting the upper end of thebearing on the arm a, and the cover a is held in place by ajam-nut,which screws on the spindle a and against the said cover ax. On theupper end ofthe spindle a also screws the button-holder a supporting thebutton D to be ground. The latter is held in place on the holder (0 bythe pin a having a leather-covered head and turning in asocket formed onthe arm a, which is provided with a handle,a", and is pivoted on thespindle-frame A. A bent spring, a fastened on the frame A, presses onthe arm a" and holds thelatterin contact with the button D.

A spring, F, pivoted by one end in the box B, is secured by its otherend to the frame A. In a slot in the frame is held adjustably the boltx, projecting into a recess formed in the arm or plate G, pivoted on thescrew-rod g,screwing in a nut, g, provided with a hand-wheel, g andadapted tobe held by means ot'asetscrew, g, in the bracket/",secured bybolts or other means to one end of the said box B. In the lower part ofthe bracketf screws a rod, f, the inner end of which abuts against thesaid spring F, and the rod f serves to increase or diminish the tensionof the spring F. The spring F forces the frame A and its button Dagainst the grindingwheel 0, while the plate or arm G- limits the inwardmotion of the said frame A and its button D in relation to thegrinding-wheel C.

The lateral adjustment of the rod b permits of placing the frame A ineither a vertical or an inclined position,and thus permits ofgrindingthe edge of the button D held on the said frame A cylindrically orconically.

Any desired number ofspindle-frames A and connections can be fulcrumedon the said rod b.so as to grind several buttons at the same time on thewheel G. Then a button D is ground and is to be removed from the spindlea and to be replaced by a fresh one, then the spindleframe A is pulledbackward,so that the bolt 00 engages the enlarged part of the slotformed in the plate G, thus holding the spindle-frame A in an inclinedposition, and at the same time disengaging the button from the grindingwheel 0. The operator now takes hold of the handle a and turns the samedownward,so that the pin a disengages the button D, which is removed andreplaced by a new one, and when the operator now releases the handle a"then the spring a returns the arm a to its former position, so that theleather-covered head of the pin a, engages the new button D.

At the same time the operator lifts the plate or arm G upward slightly,so that the pin or bolt w is disengaged from the enlarged part of therecess in the said plate,whereby the spring F forces the spindle-frameinward and the button against the grinding-wheel O. The edge of thebutton is then ground off by the grinding-wheel C until the inwardmotion of the spindle-frame A is interrupted by the bolt w coming incontact with theinner end of the slot in plate G.

Any number of grinding'wheels C may be mounted on a common shaft, 0,which is driven by means of one belt-pulley, c. In this case the worms Eof all the grinding devices are fixed to a common shaft, 6, carrying abelt-put ley, e, which imparts motion to all the said worms E.

Having thus fully described my invention, I claim as new and desire tosecure by Letters Patent- 1. In an apparatus for grinding the edges ofcircular buttons,the combinatiomwith a rotary tending to move the freeend of the said frame toward the cylindrical surface of thegrindjug-wheel, a screw extending toward the said frame and having aslotted plate on its inner end, and a pin freely passing through theslots I of the screw and frame,substantially as and for the purposedescribed.

2. In an apparatus for grinding the edges of circular buttons, thecombination, with a vertically-revoluble grinding-wheel, of a framehaving a longitudinal slot and an axis parallel to that of thegrinding-wheel, a rotary spindle supported by the said frameperpendicular to the axis of the grinding-wheel and having thebutton-holder near its free end, a spring constantly pressing the freeend of the said frame toward the cylindrical surface of thegrindingwheel,ascrew extending toward the said frame, agravitating platearticulated to the inner end of the screw and provided with alongitudinal slot the end of which, near the screw, has anupwardly-extending recess formed in it,and a pin freely passing throughthe said slot and the longitudinal slot of the frame,substantially asand for the purpose described.

In testimony whereof I affix my signature in presence of two witnesses.

JACOB MAI-ILA.

Witnesses:

EDUARD HISOHE, I. J AMMANN.

